drm/omap: use drm_for_each_bridge_in_chain_from()

Use drm_for_each_bridge_in_chain_from _scoped() instead of an open-coded
loop based on drm_bridge_get_next_bridge() to ensure the bridge being
looped on is refcounted and simplify the driver code.

Reviewed-by: Maxime Ripard <[e-mail]>
Link: https://lore.kernel.org/r/20[e-mail]
Signed-off-by: Luca Ceresoli <[e-mail]>

drivers/gpu/drm/omapdrm/omap_encoder.c

···
 	struct omap_dss_device *output = omap_encoder->output;
 	struct drm_device *dev = encoder->dev;
 	struct drm_connector *connector;
-	struct drm_bridge *bridge;
 	struct videomode vm = { 0 };
 	u32 bus_flags;
 
···
 	 *
 	 * A better solution is to use DRM's bus-flags through the whole driver.
 	 */
-	for (bridge = output->bridge; bridge;
-	     bridge = drm_bridge_get_next_bridge(bridge)) {
+	drm_for_each_bridge_in_chain_from(output->bridge, bridge) {
 		if (!bridge->timings)
 			continue;